Mike, the textures are using the alternate diffuse and alternate specular inputs.  Yes, the color texture map is plugged into the diffuse input, but notice that the value is 0.  The color texture map is actually producing its effect by driving a chain of scatter/HSV/diffuse/blender nodes on its way to the alternate diffuse input jack.

  You would need to change this image map.  Use the advanced material room.  adding a new map to the diffuse jack will only brighten the texture.

Poser 12, in feet.  

OSes:  Win7Prox64, Win7Ultx64

Silo Pro 2.5.6 64bit, Vue Infinite 2014.7, Genetica 4.0 Studio, UV Mapper Pro, UV Layout Pro, PhotoImpact X3, GIF Animator 5